<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=473400
-->
<head>
  <title>Test for Bug 473400</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body onload="run()">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=473400">Mozilla Bug 473400</a>
<iframe id="subdoc" src="about:blank"></iframe>
<div id="content" style="display: none">
  
</div>
<pre id="test">
<script class="testbody" type="application/javascript; version=1.7">

/** Test for Bug 473400 **/

SimpleTest.waitForExplicitFinish();

function run() {
  var subdoc = document.getElementById("subdoc").contentDocument;
  var subwin = document.getElementById("subdoc").contentWindow;
  var style = subdoc.createElement("style");
  style.setAttribute("type", "text/css");
  subdoc.getElementsByTagName("head")[0].appendChild(style);
  var sheet = style.sheet;
  var iframe_style = document.getElementById("subdoc").style;

  // Create a style rule and an element now based on the given media
  // query "q", and return the computed style that should be passed to
  // query_applies to see if that query currently applies.
  var n = 0;
  function make_query(q) {
    var i = ++n;
    sheet.insertRule("@media " + q + " { #e" + i + " { text-decoration: underline; } }", sheet.cssRules.length);
    var e = subdoc.createElement("div");
    e.id = "e" + i;
    subdoc.body.appendChild(e);
    var cs = subdoc.defaultView.getComputedStyle(e, "");
    cs._originalQueryText = q;
    return cs;
  }
  function query_applies(cs) {
    return cs.getPropertyValue("text-decoration") == "underline";
  }

  function should_apply(cs) {
    ok(query_applies(cs), cs._originalQueryText + " should apply");
  }

  function should_not_apply(cs) {
    ok(!query_applies(cs), cs._originalQueryText + " should not apply");
  }

  var content_div = document.getElementById("content");
  content_div.style.font = "initial";
  var em_size =
    getComputedStyle(content_div, "").fontSize.match(/^(\d+)px$/)[1];

  let width_val = 317; // pick two not-too-round numbers
  let height_val = 228;
  iframe_style.width = width_val + "px";
  iframe_style.height = height_val + "px";
  var wh_queries = [
    make_query("all and (min-width: " +
                     (Math.ceil(width_val/em_size) + 1) + "em)"),
    make_query("all and (min-width: " +
                 (Math.floor(width_val/em_size) - 1) + "em)"),
    make_query("all and (max-width: " +
                 (Math.ceil(width_val/em_size) + 1) + "em)"),
    make_query("all and (max-width: " +
                     (Math.floor(width_val/em_size) - 1) + "em)"),
    make_query("all and (min-width: " +
                     (Math.ceil(width_val/(em_size*2)) + 1) + "em)"),
    make_query("all and (min-width: " +
                 (Math.floor(width_val/(em_size*2)) - 1) + "em)"),
    make_query("all and (max-width: " +
                 (Math.ceil(width_val/(em_size*2)) + 1) + "em)"),
    make_query("all and (max-width: " +
                     (Math.floor(width_val/(em_size*2)) - 1) + "em)")
  ];

  is(wh_queries[0].fontSize, em_size + "px", "text zoom is 1.0");
  should_not_apply(wh_queries[0]);
  should_apply(wh_queries[1]);
  should_apply(wh_queries[2]);
  should_not_apply(wh_queries[3]);
  SpecialPowers.setTextZoom(subwin, 2.0);
  isnot(wh_queries[0].fontSize, em_size + "px", "text zoom is not 1.0");
  should_not_apply(wh_queries[4]);
  should_apply(wh_queries[5]);
  should_apply(wh_queries[6]);
  should_not_apply(wh_queries[7]);
  SpecialPowers.setTextZoom(subwin, 1.0);
  is(wh_queries[0].fontSize, em_size + "px", "text zoom is 1.0");
  is(subwin.innerHeight, 228, "full zoom is 1.0");
  should_not_apply(wh_queries[0]);
  should_apply(wh_queries[1]);
  should_apply(wh_queries[2]);
  should_not_apply(wh_queries[3]);
  SpecialPowers.setFullZoom(subwin, 2.0);
  isnot(subwin.innerHeight, 228, "full zoom is not 1.0");
  should_not_apply(wh_queries[4]);
  should_apply(wh_queries[5]);
  should_apply(wh_queries[6]);
  should_not_apply(wh_queries[7]);
  SpecialPowers.setFullZoom(subwin, 1.0);
  is(subwin.innerHeight, 228, "full zoom is 1.0");


  // Now test that certain things *don't* happen, i.e., that we're
  // making the optimizations we expect.
  subdoc.body.textContent = "";
  subdoc.body.appendChild(subdoc.createElement("div"));
  for (var ruleIdx = sheet.cssRules.length; ruleIdx-- != 0; ) {
    sheet.deleteRule(ruleIdx);
  }

  var utils = SpecialPowers.getDOMWindowUtils(subwin);
  var elementsRestyled, framesConstructed, framesReflowed;
  function reset_change_counters()
  {
    elementsRestyled = utils.elementsRestyled;
    framesConstructed = utils.framesConstructed;
    framesReflowed = utils.framesReflowed;
  }

  function flush_and_assert_change_counters(desc, expected) {
    subdoc.body.offsetHeight;

    if (!("restyle" in expected) ||
        !("construct" in expected) ||
        !("reflow" in expected)) {
      ok(false, "parameter missing expectation");
      return;
    }

    var restyles = utils.elementsRestyled - elementsRestyled;
    var constructs = utils.framesConstructed - framesConstructed;
    var reflows = utils.framesReflowed - framesReflowed;

    (expected.restyle ? isnot : is)(restyles, 0, "restyle count: " + desc);
    (expected.construct ? isnot : is)(constructs, 0,
                                      "frame construct count: " + desc);
    (expected.reflow ? isnot : is)(reflows, 0, "reflow count: " + desc);

    reset_change_counters();
  }

  subdoc.body.offsetHeight;
  reset_change_counters();

  iframe_style.width = "103px";
  flush_and_assert_change_counters("change width with no media queries",
    { restyle: false, construct: false, reflow: true });

  flush_and_assert_change_counters("no change",
    { restyle: false, construct: false, reflow: false });

  iframe_style.height = "123px";
  flush_and_assert_change_counters("change height with no media queries",
    { restyle: false, construct: false, reflow: true });

  sheet.insertRule("@media (min-width: 150px) { div { display:flex } }", 0);
  flush_and_assert_change_counters("add non-matching media query",
    // FIXME: We restyle here because
    // nsIPresShell::RestyleForCSSRuleChanges posts a restyle, but it's
    // probably avoidable if we wanted to avoid it.
    { restyle: true, construct: false, reflow: false });

  iframe_style.width = "177px";
  flush_and_assert_change_counters("resize width across media query with 'display'",
    { restyle: true, construct: true, reflow: true });

  iframe_style.width = "162px";
  flush_and_assert_change_counters("resize width without crossing media query",
    { restyle: false, construct: false, reflow: true });

  sheet.deleteRule(0);
  flush_and_assert_change_counters("remove matching media query with 'display'",
    { restyle: true, construct: true, reflow: true });

  sheet.insertRule("@media (max-height: 150px) { div { display:flex } }", 0);
  flush_and_assert_change_counters("add matching media query with 'display'",
    { restyle: true, construct: true, reflow: true });

  iframe_style.height = "111px";
  flush_and_assert_change_counters("resize height without crossing media query",
    { restyle: false, construct: false, reflow: true });

  iframe_style.height = "184px";
  flush_and_assert_change_counters("resize height across media query with 'display'",
    { restyle: true, construct: true, reflow: true });

  sheet.deleteRule(0);
  flush_and_assert_change_counters("remove non-matching media query",
    // FIXME: We restyle here because
    // nsIPresShell::RestyleForCSSRuleChanges posts a restyle, but it's
    // probably avoidable if we wanted to avoid it.
    { restyle: true, construct: false, reflow: false });

  SimpleTest.finish();
}

</script>
</pre>
</body>
</html>

